Hydroprocessing of vacuum residues: Asphaltene characterization and solvent extraction of spent slurry catalysts and the relationships with catalyst deactivation
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- 作者：Cesar Ovalles ; covalles@chevron.com ; Estrella Rogel ; Michael E. Moir ; Axel Brait
- 关键词：Hydroprocessing ; Asphaltene characterization ; Spent slurry catalysts ; Catalyst deactivation
- 刊名：Applied Catalysis A: General
- 出版年：2017
- 出版时间：25 February 2017
- 年：2017
- 卷：532
- 期：Complete
- 页码：57-64
- 全文大小：907 K
- 卷排序：532
文摘
Slurry phase hydroprocessing showed that 2.5 & 5 wt% Mo catalysts showed signs of deactivation after four- to five-hours of reaction time. Solvent extraction of spent slurry catalysts showed that more asphaltenes deposited on the 2.5 wt% deactivated catalysts than on the 5 wt% analog. Fractions removed by solvent extractions are related to coke formation and might be responsible for catalyst deactivation. Pyridine organic extract was more aromatic and had a higher concentration of the highest solubility parameter asphaltenes.